// Echarts 实例
let echartsInstance = null;

// 3D 环形图固定配置数据
const ringChartsList = [
  {
    name: "正常",
    itemStyle: {
      color: "rgba(45, 155, 252, 1)"
    }
  },
  {
    name: "异常",
    itemStyle: {
      color: "rgba(238, 249, 249, 1)"
    }
  },
  {
    name: "故障",
    itemStyle: {
      color: "rgba(255, 116, 76, 1)"
    }
  }
];

// 获取折线类型
const ringType = ringChartsList.map(item => item.name);

/**
 * 3D 环形图配置处理方法
 * @param {Array<Object>} data 传入相关数据
 * @param {Object} chartInstance 传入 Echarts 实例
 * @returns {Object} 返回 Echarts Option 配置
 */
export const ring3DOptionHandler = (data = [], chartInstance = null) => {
  echartsInstance = chartInstance;
  const compoundData = data.map(item => {
    const chartsData = ringChartsList.find(chart => chart.name == item.name);
    return { ...item, ...chartsData };
  });
  const seriesList = getPie3D(compoundData, 0.8, 240, 28, 26, 0.5);

  return {
    legend: {
      data: ringType,
      bottom: "5%",
      itemWidth: 10,
      itemHeight: 10,
      formatter: name => {
        const { value, rate } = data.find(item => item.name == name);
        return `{name|${name}}\n{rate|${rate}%}\n{value|${value}}`;
      },
      itemGap: 50,
      textStyle: {
        fontSize: 12,
        color: "#fff",
        rich: {
          name: {
            padding: [50, 0, 0, 0]
          },
          rate: {
            padding: [10, 0]
          }
        }
      }
    },
    animation: true,

    tooltip: {
      formatter: params => {
        const { marker, seriesName, seriesIndex } = params;
        const seriesNameList = ["mouseoutSeries", "pie2d"];
        if (seriesNameList.includes(seriesName)) return;
        const { name, rate, value } = compoundData[seriesIndex];

        updateGraphicConf(compoundData[seriesIndex]);

        return `${marker}${name}：${rate}%\t${value}个`;
      },
      backgroundColor: "rgba(3, 26, 47, 0.6)",
      textStyle: { color: "#fff", fontSize: 12 }
    },

    labelLine: { show: false },
    label: { show: false },

    xAxis3D: {
      min: -1,
      max: 1
    },
    yAxis3D: {
      min: -1,
      max: 1
    },
    zAxis3D: {
      min: -1,
      max: 1
    },

    grid3D: {
      show: false,
      height: "75%",
      boxHeight: 0.5,
      viewControl: {
        distance: 180,
        alpha: 28,
        beta: 60,
        autoRotate: false
      }
    },

    graphic: createGraphicConf(compoundData[0]),

    series: seriesList
  };
};

/**
 * 生成扇形的曲面参数方程方法
 * @param {Number} startRatio 起始比率
 * @param {Number} endRatio 结束比率
 * @param {Number} isSelected 是否选中
 * @param {Number} isHovered 是否悬停
 * @param {Number} k 辅助参数 k（默认值 1/3）
 * @param {Number} height 返回曲面参数方程
 * @returns {Object} 返回曲面参数方程
 * @description 用于 series-surface.parametricEquation
 */
function getParametricEquation(
  startRatio,
  endRatio,
  isSelected,
  isHovered,
  k,
  height
) {
  // 计算
  let midRatio = (startRatio + endRatio) / 2;

  let startRadian = startRatio * Math.PI * 2;
  let endRadian = endRatio * Math.PI * 2;
  let midRadian = midRatio * Math.PI * 2;

  // 如果只有一个扇形，则不实现选中效果。
  if (startRatio === 0 && endRatio === 1) {
    isSelected = false;
  }

  // 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
  k = typeof k !== "undefined" ? k : 1 / 3;

  // 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
  let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0;
  let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0;

  // 计算高亮效果的放大比例（未高亮，则比例为 1）
  let hoverRate = isHovered ? 1.05 : 1;

  // 返回曲面参数方程
  return {
    u: {
      min: -Math.PI,
      max: Math.PI * 3,
      step: Math.PI / 32
    },

    v: {
      min: 0,
      max: Math.PI * 2,
      step: Math.PI / 20
    },

    x: function(u, v) {
      if (u < startRadian) {
        return (
          offsetX + Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate
        );
      }
      if (u > endRadian) {
        return (
          offsetX + Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate
        );
      }
      return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate;
    },

    y: function(u, v) {
      if (u < startRadian) {
        return (
          offsetY + Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate
        );
      }
      if (u > endRadian) {
        return (
          offsetY + Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate
        );
      }
      return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate;
    },

    z: function(u, v) {
      if (u < -Math.PI * 0.5) {
        return Math.sin(u);
      }
      if (u > Math.PI * 2.5) {
        return Math.sin(u);
      }
      return Math.sin(v) > 0 ? 1 * height : -1;
    }
  };
}

/**
 * 生成模拟 3D 饼图的配置项方法
 * @param {Array<Object>} pieData 饼图数据
 * @param {*} internalDiameterRatio
 * @returns
 */
function getPie3D(pieData, internalDiameterRatio) {
  let series = [];
  let sumValue = 0;
  let startValue = 0;
  let endValue = 0;
  let legendData = [];
  let k =
    typeof internalDiameterRatio !== "undefined"
      ? (1 - internalDiameterRatio) / (1 + internalDiameterRatio)
      : 1 / 3;

  // 为每一个饼图数据，生成一个 series-surface 配置
  for (let i = 0; i < pieData.length; i++) {
    sumValue += pieData[i].rate;

    let seriesItem = {
      name:
        typeof pieData[i].name === "undefined" ? `series${i}` : pieData[i].name,
      type: "surface",
      parametric: true,
      wireframe: { show: false },
      pieData: pieData[i],
      pieStatus: {
        selected: false,
        hovered: false,
        k: k
      },
      label: {
        show: true,
        formatter: function(params) {
          return `${params.name}\n${params.value}`;
        },
        backgroundColor: "#fff"
      }
    };

    if (typeof pieData[i].itemStyle != "undefined") {
      let itemStyle = {};

      typeof pieData[i].itemStyle.color != "undefined"
        ? (itemStyle.color = pieData[i].itemStyle.color)
        : null;
      typeof pieData[i].itemStyle.opacity != "undefined"
        ? (itemStyle.opacity = pieData[i].itemStyle.opacity)
        : null;

      seriesItem.itemStyle = itemStyle;
    }
    series.push(seriesItem);
  }

  // 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
  // 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
  for (let i = 0; i < series.length; i++) {
    endValue = startValue + series[i].pieData.rate;
    series[i].pieData.startRatio = startValue / sumValue;
    series[i].pieData.endRatio = endValue / sumValue;
    series[i].parametricEquation = getParametricEquation(
      series[i].pieData.startRatio,
      series[i].pieData.endRatio,
      false,
      false,
      k,
      series[i].pieData.rate
    );

    startValue = endValue;

    legendData.push(series[i].name);
  }

  // 底部托盘内层样式
  series.push({
    name: "mouseoutSeries",
    type: "surface",
    parametric: true,
    wireframe: { show: false },
    itemStyle: { color: "rgba(36, 91, 122, 0.2)" },
    parametricEquation: {
      u: {
        min: 0,
        max: Math.PI * 2,
        step: Math.PI / 20
      },
      v: {
        min: 0,
        max: Math.PI,
        step: Math.PI / 20
      },
      x: function(u, v) {
        return ((Math.sin(v) * Math.sin(u) + Math.sin(u)) / Math.PI) * 2;
      },
      y: function(u, v) {
        return ((Math.sin(v) * Math.cos(u) + Math.cos(u)) / Math.PI) * 2;
      },
      z: function(u, v) {
        return Math.cos(v) > 0 ? -5 : -7;
      }
    }
  });

  // 底部托盘外层样式
  series.push({
    name: "mouseoutSeries",
    type: "surface",
    parametric: true,
    wireframe: { show: false },
    itemStyle: { color: "rgba(58, 86, 130, 0.15)" },
    parametricEquation: {
      u: {
        min: 0,
        max: Math.PI * 2,
        step: Math.PI / 20
      },
      v: {
        min: 0,
        max: Math.PI,
        step: Math.PI / 20
      },
      x: function(u, v) {
        return ((Math.sin(v) * Math.sin(u) + Math.sin(u)) / Math.PI) * 2.2;
      },
      y: function(u, v) {
        return ((Math.sin(v) * Math.cos(u) + Math.cos(u)) / Math.PI) * 2.2;
      },
      z: function(u, v) {
        return Math.cos(v) > 0 ? -7 : -7;
      }
    }
  });
  return series;
}

/**
 * 创建相关 Graphic 配置方法
 * @param {Object} data 传入相关数据
 * @returns {Object} 返回 Echarts Option Graphic 配置
 */
const createGraphicConf = data => {
  return [
    {
      type: "group",
      left: "center",
      bottom: "55%",
      children: [
        {
          type: "text",
          style: {
            text: `${data.rate}%\n`,
            textAlign: "center",
            fill: "#fff",
            fontSize: 14
          }
        },
        {
          type: "text",
          top: 18,
          style: {
            text: `${data.name}`,
            textAlign: "center",
            fill: "#fff",
            fontSize: 10
          }
        }
      ]
    }
  ];
};

/**
 * 更新相关 Graphic 配置方法
 * @param {Object} data 传入相关数据
 */
const updateGraphicConf = data => {
  if (!echartsInstance) return;
  const graphic = createGraphicConf(data);
  echartsInstance.setOption({ graphic });
};
